Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

  • Announcements

    • Kent

      Sign In or Password Problems?   10/09/2016

      If you can't Sign In, you need to reset your password.  Use the Forgot Your Password link at the bottom of the Sign In screen, and the site will send you an email to reset it. If you have an AOL email account, use the Contact Us link at the bottom of the screen -- AOL is intermittently blocking email from the site.
    • Kent

      Feedback Please!   10/28/2017

      See News and Announcements forum.
Sign in to follow this  
Chris727

Loosening headbolts

Recommended Posts

Chris727
Hi. I have been having trouble with the headbolts on my 700, it has the 8hp Briggs Cast Iron replacement engine. When I first bought the tractor I put a new head gasket on. It blew it after a month or less. I noticed the bolts tended to loosen up some. I recently replaced the gasket again, this time I used copper coat on it. All of the bolts were torqued correctly and rechecked before running. After running it I noticed it had blown the gasket again. After only 15 to 20 minutes or running the bolts had loosened to only being hand tight. I had used anti-sieze on some of them. Could the washers need replacement? Do I need to retorque the bolts after warming it up? Has anyone else had this problem? Thanks in advance. Chris

Share this post


Link to post
Share on other sites
D-17_Dave
The problem is the use of the anti-sieze. These bolts exspand and contract a large amount. This stretching allows the bolts to walk themselves out. I'd make sure the head and the top of the block are still both flat. Completely clean the block threads and replace the head bolts with known good bolts and retry.

Share this post


Link to post
Share on other sites
UCD
Buy new head bolts, the old one stretch and wont hold torque. Install them with a light film of light oil. Torque to specs in the correct sequence. L head cast iron single cyl. is 190 in. lbs. or 15.83 ft lbs in 3 steps 65 in. lbs., 130 in. lbs. and 190 in. lbs. after an hour or two of run time check torque to 190 in. lbs.

Share this post


Link to post
Share on other sites
D-17_Dave
quote:
Originally posted by Ketchamized
Dave, Would it be a good idea to use loctite on the head bolts if they keep falling off? My other tractor has the same problem.
Eric, useing added stuff like loctite and such would be overkill. By useing the above "approved" suggestions there shouldn't be any problems. Also with the softness of the cast iron block, something like loctite would probably remove any threads and severly damage the block.

Share this post


Link to post
Share on other sites
Ketchamized
Maynard and Dave, Thanks for the warning. It's a good thing I always ask before doing something that may be stupid & damaging to my tractor. :) You guys are saving me a fortune and I'm learning a lot from you. Thanks again.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

×